# Supported Networks

> Documentation index: [llms.txt](https://namera.ai/llms.txt).

Source: https://namera.ai/docs/sdk/supported-networks

Choose a mainnet or testnet for your SDK calls.

Namera supports eight EVM networks. Use `namespace: "eip155"` and the full
`chainId` string when executing, simulating, or signing.

## Mainnets [#mainnets]

| Network      | Chain ID       |
| ------------ | -------------- |
| Ethereum     | `eip155:1`     |
| Base         | `eip155:8453`  |
| Arbitrum One | `eip155:42161` |
| OP Mainnet   | `eip155:10`    |

## Testnets [#testnets]

| Network          | Chain ID          |
| ---------------- | ----------------- |
| Ethereum Sepolia | `eip155:11155111` |
| Base Sepolia     | `eip155:84532`    |
| Arbitrum Sepolia | `eip155:421614`   |
| OP Sepolia       | `eip155:11155420` |

The [Getting Started](https://namera.ai/docs/sdk/getting-started) walkthrough uses **Base Sepolia**.
Fund the account with test ETH on that network before sending a transfer.

## Select a Network [#select-a-network]

Import `SupportedEvmChainId` from the SDK to type a network in your configuration:

```ts title="index.ts"
import { NameraClient, type SupportedEvmChainId } from "@namera-ai/sdk";

const namera = new NameraClient({
  apiKey: process.env.NAMERA_API_KEY!,
});

const chainId: SupportedEvmChainId = "eip155:84532";
const result = await namera.sessionKeys.get("0199dfe1-0000-7000-8000-000000000002");

if (!result.success) throw new Error(result.error.message);

const installation = result.data.installations.find(
  (entry) => entry.chainId === chainId && entry.status === "installed",
);

if (!installation) throw new Error("Install this session key on Base Sepolia first.");
```

Replace the example session-key ID with your own. An installation on one network
does not authorize another. Its validity period and permissions must also allow
your operation.

Changing `chainId` selects a network; it does not move funds between networks.
Use the recipient or contract address for the network you selected.

If a request returns `NETWORK_PAUSED`, wait for that network to be re-enabled
before submitting a new operation. You can still check existing submissions.

Next, learn how to [handle results and errors](https://namera.ai/docs/sdk/handling-results-and-errors).